Reamer



March. 24, 1925. v 1,530,846

F. P, MILLER REAMER Filed Jan. 3 :1923- 2 Sheets-Sheet 1 mAIV/T A TTOR/VE Y8 March 24, 1925.

F. P. MiLLER REAMER 'Filed Jan. 5, 1923 2 Sheets-Sheet 2 IV VE IV TOR Tk/IN Tf- V ATTORNE Y8 Patented Mar. 24, 1925.

UNITED STATES FRANK P. MILLER, or urnanvinnn, PENNS LVANIA.

REAMER.

Application filed January 3, 1923. Serial No. 610,511.

To all whom it may concern:

Be it known that I, FRANK P. M;1LLER, a citizen of the United States, and resident of Meadville, in the county of Crawford and State of Pennsylvania, have invented certain new and useful Improvements in Reamers, of which the following is a specification.

This invention relates to an inserted blade cutting tool and more particularly to the securing means for the several blades.

Briefly stated this invention is an improvement over the construction illustrated in my pending application for patent filed March 15, 1922, Serial No. 543,865and is especially designed .to securely and positively hold the blades against longitudinal movement when properly adjusted.

The invention forming the subject matter of this application is capable of use in connecting with or independently of the peculiar wedging action illustrated in the afore said application and in carrying out the invention, each bladelocking pin is formed with circumferential corrugations or ribs which interlock with similar ribs in the adjacent blade so that the same is positively held against rearward or forward movement.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings, forming a part of this application and in which like numerals are employed to designate like parts throughoutthe same,

Figure 1 is a fragmentary side elevation of an inserted blade cutting tool constructed in accordance with this invention,

Figure 2 is a group view of one of the blades, 1

Figure 3 is an end elevation of the tool, parts being broken away,

Figure 4 is a side elevation of a locking pin constructed in accordance with the invention.

of the tool, the forward portion thereof be-" ing shown in section so as to illustrate the securing means for the several blades.

Figure 7 is a group'view illustrating a slightly modified form of groove for the reception of the anchoring pin.

Figure 8 is a detail sectional view illustrating the locking pin anchored within the groove having the semhcircular teeth orv ribs, the edges of which are sharpened so as to bite into. the pin. I

Figures 9, 10, 11 and 12 illustrate various forms of blades adapted for use in connection with this invention.

In the drawing wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 10 designates a carrier, the forward portion of which is formed with an."ei.1largeineut constituting a cylindrical head 11.

Figures 1 and 6 illustrate that the head 11 is provided with a series of longitudinal channels 12 gradually increased in depth toward their rear ends and receiving blades 14.

As the inner longitudinal edges of the blades 14 flatly contact with the inner walls or bottom walls of the channels 12 the position of the blades in the channels regulates theeffective diameter of the tool. That isto say the channels 12 are considerably greater in length than the blades M and by advancing the blades in the channels as illustrated in Figure 6 the effective diameter of the tool isgreater than when the blades are positioned in the rear'portions of the channels.

However, in constructing the toolas illustrated and described in the aforesaid application, it has been found desirable to supplement the peculiar wedging action between the blades and the head by an interlocking connection between the locking pins 17 and the blades 14. The locking pins 17 are received in grooves 18 in the blades 14L and in corresponding grooves 20 in the side walls of the channels12. Figure 3 illustrates that the locking pin 17 is securely held in position by means of a small fastening or set screw 16 so that the longitudinal displacement of the associated blade is prevented. It might be stated that the several grooves '20 are first formed by drilling holes in the carrier and then milling the several longitudinal channels in the carrier, partly :through the holes previously drilled so that the grooves will be formed in the side walls of the channel. V

Figure 2 illustrates that each groove 18.

is provided with a series of transverse co-rrugations or ribs- 19 which interlock with the circumferential ribs or corrugations of the pin 17 whereby movement of the blade longitudinally of the pin is positively prevented. More specifically the blade 14 can move longitudinally when locked in position only as a result of stripping the interlocked corrugations or ribs.

Figure 5 illustrates that each groove 20 is formed with a rear end wall adapted to be engaged by the rea -r end of the pin 17 and consequently the rearward movement of the pin is positively prevented.

This particular method of locking the blade in position may be used independently of or in connection with the peculiar wedging action described and illustrated'intl'ie aforesaid application wherein it is shown that the groove 18 may extend at an angle with relation to .the inner longitudinal edge of the blade so that when the pin is locked in position the resulting wedging action will securely hold the blades in position.

The invention as illustrated in Figures 7 and 8 discloses the blade 11a provided in one side with a groove 118 having transverse corrugations or ribs 119 which as illustrated in Figure 8 are formed with shar edges to bite into a locking pin 117 'preferab ly formed from a soft metal.- By forming the pin 117 from soft metal the sharp edges of the transverse corrugations or ribs will bite into the pin so that the rearward movement of the blade is prevented.

Figure 9 illustrates a blade 200 having a pin receiving groove 201 which gradually increases in width from. an approximately .central point and therefore is wedged securely into engagement with the pin by means of the associated locking screw.

' In the form of the. invention illustrated in Figure 10 the blade is designated by the numeral 205 and is provided with a pin receiving groove 206 arranged out of parallelism to the inner longitudinal edge of the blade and gradually increases in width toward the rear end thereof. Figure 11 illustrates that the blade 210 may be provided with a groove 211 gradually increasing in width and depth toward the enlarged end thereof for the reception of the locking pin.

Finally Figure 12 illustrates that the blade 215 may be provided with a groove 216 arranged out of parallelism to the inner longitudinal edge of the blade and this groove may or may not be of the same width and depth throughout.

In carrying out the invention forming the subject matter of this application either the ribs 19 or 119 may be provided in the various types of grooves without departing from the spirit of the invention and in summarizing, it'might be stated that the roughened surfaces between the pins and blades forms a reliable means for holding the blades in position independently of the wedging action.

Having thus described the invention, what Iclaim is:

grooves being formed with end walls with which the adjacent ends of the pins are flatly engaged to hold the pins against rearward movement.

2. A tool of the character specified como prising a carrier havlng blade-rece ving channels, the side walls of the channels being provided with grooves, blades adjustable in the channels and having grooves, soft iron pins fitted in the grooves of the blades and channels, the Walls of the'grooves of the blades being provided with teeth designed to bite into the pins, the rear end wall of each groove of the carrier being 1. A tool of the character specified com' flatly engaged with the adjacent end of the pin associated therewith.

FRANK P. MILLER. 

